Pool nucleate boiling heat transfer experiments from coated surfaces with porous copper (Cu) and molybdenum (Mo) and spirally wrapped with helical wire on copper surfaces with micro-roughness immersed in saturated R-134a and R-600a were conducted. The influence of coating thickness, porosity, wrapped helical angle, and wire pitch on heat transfer and boiling characteristics including bubble parameters were studied. The enhanced surface heat transfer coefficients with R-600a as refrigerant found are 2.4 times higher than those of the smooth surfaces. Photographs indicate that the average number of bubbles and bubble departure diameters has been found to increase linearly with heat flux, while the bubble diameters exhibit opposite trend in both refrigerants. Furthermore, the heat transfer of the boiling process for the present enhanced geometry (coated and wrapped) was modeled and analyzed. The experimental data for plasma coating and spirally wrapped surfaces were correlated in terms of relevant parameters, respectively to provide a thermal design basis for engineering applications.
Nucleate Pool Boiling From Coated and Spirally Wrapped Tubes in Saturated R-134a and R-600a at Low and Moderate Heat Flux
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division August 3, 2000; revision received December 4, 2000. Associate Editor: F.-B. Cheung.
- Views Icon Views
- Share Icon Share
- Cite Icon Cite
- Search Site
Hsieh, S., and Yang, T. (December 4, 2000). "Nucleate Pool Boiling From Coated and Spirally Wrapped Tubes in Saturated R-134a and R-600a at Low and Moderate Heat Flux ." ASME. J. Heat Transfer. April 2001; 123(2): 257–270. https://doi.org/10.1115/1.1351818
Download citation file:
- Ris (Zotero)
- Reference Manager